Improvement in locks for locking the foot of boot-trees



2 sheerS--she'er 1".

1. H 0 W E. l Locks for Locking the Foot of Boot-Trees.

'Patenteddune 9,1874.

Fig.

. 2 Shees--SheetZ- LHOWE. Lacks for'Locking-the Foot of Bont-Trees.

Fig. 6.

Patented June 9,1874.

l.; l a

but will force it upward UNTD hSTATES.

PATENT OFFICE,

J ARVIS HOVVE, OF MILFORD, MASSACHUSETTS.

IMPROVEMENT IN LOCKS FOR LocKlNe THE FooT oF Boor-TREES.

Specification forming part of Letters Patent No. 151,700, dated June 9, 1874; application tiled November 29, 1873.

To all whom it may concern:

Be it known that I, J ARVIS HOWE, of Milford, in the State of Massachusetts, -have invented a Lock for Locking the Foot of Trees for Treeing Boots and Shoes, of which the-following is a specification:

In most machine-trees the foot is detachable, and consequently, when in use, requires to be locked in place. All the locks heretofore used in this process, known to me, are objectionable; and the object of my invention is to furnish a lock which will not only hold the foot in place, into its proper place.

My invention consists in the combination of a hooked rod, which catches upon a hook on the foot with the distendin g mechanism of the tree by means of a spring, so that the power applied to move the distendin g mechanism will act, through the spring, upon the hooked rod, and thereby force the upper part of the foot into close contact with the lower part of the front of the tree.

In the drawings, I have shown my lock applied to the cast-iron center-piece of a wellknown form of boot-tree, the wooden front and back of which are not shown. In this form of tree the distending mechanism is moved upward by power applied to the stretching-rod A, and downward (back again to its first position) by the spiral spring B. The foot C is attached to a foot-iron, D, which fits and slides in a dovetailed groove in the centerpiece E, and this foot-iron has a hook upon its upper part. All these parts are well known and in common use. My lock consists of the hooked rod F, which is sov mounted that it can be properly moved to cause its hook to engage with the hook attached to the foot, and in order that the foot may be forced upward, and thus the upper part of the foot be forced into close contact with the lower part of the front. In order to unlock the foot, and to bring the hooked rod back to its rst position, these movements are reversed.

Figure l shows one form of my lock, in which the hooked rod F is moved laterally, to cause its hook to engage with the hook 011 the foot, and endwisc to force the foot upward and into close contact with the upper part of the front. These motions are produced by the motion of the piece G, which is attached to and moves the piece G upon the inclined surface of the rod F being insufficient to produce an endwise motion of the rod F against the spring I. The

continued motion of the piece G carries forward the slide J, and thus compresses the spring K, which produces an endwise movement of the rod F by bearing upon the pin L in the rod F, and thereby forces the foot upward. When the cross-head returns to its first position, the piece G returning with it allows the spring K to force the slide J back again to the end of the slot in the rod F, in which that slide moves, and also allows the spring I to move the rod F endwise back to its first position; and at the end of its return movement this piece G moves the rod F laterally, so as to disengage its hook from the hook ofthe foot. A

The necessary motion of the cross-head H is much greater than the necessary motion of the rod F, and it is for this reason that I cause the motion of the cross-head tobe imparted to the rod through the spring K. The rod F, in its endwise movements, slides through a slot in the saddle M, and is prevented from moving; too far backward by the pin N. The spring I is confined between the pin L and saddle M. This spring I serves two.purposes: First, it insures the return of the rod F to its iirst position 5 and, secondly, it prevents the friction of the piece G upon the incline on the rod from moving the rod endwise instead of laterally; but it is obvious that a pin, a, inserted in the rod, asshown in Fig. 3, will perform the first of these functions, while a latch, such as that marked bin that figure, which is lifted by the forward movement 0f the slide J, will perform the second. It is also obvious that the hooked rod need not be moved laterally before it begins its endwise movement, as this endwise movement causes its lateral movement in Figs. 4 and 6. It is also obvious that the spring through which the motion of the cross-head is imparted to the hooked rod need not be on the hooked rod, as is shown in Figs. 5 and 6, where a portion ofthe stretching-rod spring B is utilized for this purpose.

In Figs. 3 and 4, the stretching-rod spring Y B, acting through the peceGand pin a, causes the return of the rod F- to its first position, While in Figs. 5 and 6 this is accomplished by that part of the spring B which lies above the pin c, and which is marked I, because it performs the most important function of the spring I in Figs. 1 and 2. In like manner, the lower part ofthe spring B is marked K in Figs. 5 and 6, because it performs the function of spring K in Figs. 1 and 2.

It is not absolutely necessary that the spring through which the rod F is connected to the cross-head should cause the rod to move laterally and endwise, as it may be so mounted as to move only on its axis if the hook upon it be made in the form of a screwthread eXtendin g partly around the rod7 the foot in this case bein g forced upward by the motion on its axis of, the spiral 'flan ge which forms the hook; but I deem it unnecessary to furnish drawings showing this mode of applying the principle of my invention, for the reason that the mode described-namely, causin g the sprin g to move the rod both laterally and endWise--isA the best mode in which I, have contemplated appl ying that principle.

IV hat I claim as my invention isl. The combination of the hooked rod F with the foot and the disteuding mechanism of the tree, and the spring K, substantially as and for the purpose specified.

2. The combination of the spring I with the hooked rod F, the foot, the distending mechanism of the tree, and the spring K., substantially as and for the purpose specified.

Signed this 5th day of March, 1873.

` JARVIS HOVE.

ll'litnesses:

J. E. MAYNADIER, HENRY W. HOLLAND. 

